Hi! In my opinion there are several dapps.
For people who love to play of course it's SteemMonsters, @Magicdice and @8ballclub
For people who feels more comfortable in social area it's @share2steem
For that who active it's @actifit fitness tracker
And also I whant to mention @Partiko.
All this dapps can bring mass adoption but every in it's own area.
Posted using Partiko Android